#include <stdio.h>

int factorial(int a);
float arctan(float x, int n);
double arctanDouble(double x, int n);

float SerieDeGregory(int n);
double SerieDeGregoryDouble(int n);

float Machin(int n, int m);
double MachinDouble(int n, int m);

float Ramanujan(int n);
double RamanujanDouble(int n);





